Single Umbilical ArteryUmbilical ArteriesDigestive System AbnormalitiesUltrasonography, PrenatalUmbilical CordCardiovascular AbnormalitiesFetal Growth RetardationFetal DiseasesPregnancyGestational AgeAbnormalities, MultipleUltrasonography, DopplerBlood Flow VelocityUltrasonography, Doppler, ColorCongenital AbnormalitiesUmbilical VeinsKaryotypingPlacental CirculationArteriesHeart Rate, FetalInfant, NewbornUltrasonography, Doppler, PulsedFetal DistressPulsatile FlowFetal MonitoringPlacental InsufficiencyFetusCerebral ArteriesPulmonary ArteryPregnancy OutcomeFetal BloodPregnancy Trimester, ThirdMiddle Cerebral ArteryCarotid ArteriesPlacentaFemoral ArteryUterine ArteryRenal ArteryPregnancy Trimester, SecondFetal HypoxiaHernia, UmbilicalMesenteric Arteries